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T1 GEMS-Water Operational Guide
A1 United Nations Environment Programme, 
A1 World Health Organization, 
A1 United Nations Educational, Scientific and Cultural Organization
A1 World Meteorological Organization, 
A2 Meybeck, Michel
A2 Bartram, Jamie
A2 Wheeler, David
K1 water
K1 pollutant
K1 river
K1 lake
K1 groundwater
YR 1992
FD 1992
LK https://wedocs.unep.org/handle/20.500.11822/8248
UL https://wedocs.unep.org/handle/20.500.11822/8248
NO This operational guide sets out harmonised technical procedures for the Global Water Quality Monitoring and Assessment programme coordinated by the United Nations Environment Programme, the World Health Organization, the United Nations Educational, Scientific and Cultural Organization and the World Meteorological Organization. It defines criteria for selecting monitoring stations across rivers, lakes and groundwater, and specifies sampling frequencies, field methods and laboratory analytical techniques for physical, chemical, biological and microbiological variables, including particulate matter. The guide details sample handling, quality control, inter-laboratory comparison, and data validation processes to improve accuracy and comparability. It also establishes standardised formats for data reporting, processing, analysis and periodic global assessment of freshwater quality.
DS UN Environment Document Repository
RD Sep 17, 2026